+ + Narvi
Let's see, these two brilliant individuals (elf
and dwarf) get together to make and label
a crucial entrance to the greatest dwarf
dwelling in Middle-earth, one that's also a
source of mithril, and they stick a sign on it
with the uncrackable code of needing to say
"Friend" to come in!
Obviously this door also
had mystical properties dumbing down anyone who
came up to it. And it's Narvi who's elected
for ouster, not Celebrimbor, since he okayed
this inscrutable password and it's his people's
place.